Explanation:
Metals usually have stronger electron affinity than non-metals:
In the periodic table, the trend of electron affinity is that it increases from left to right across the period and decrease down the group.
False
Noble gas elements have a very large value for electron affinity:
Electron affinity is the change in energy of an atom when an electron is added. Noble gases already have a complete octet configuration hence there is no reason to accept any electrons. This makes their electron affinity value less than or equal to zero.
False
Negative anions have a larger ionic radius than the atomic radius of their neutral atom:
Neutral atoms that gain electron are referred to as anions. The extra electron increases the electron-electron repulsion which pushes the electrons further apart and finally increased radius.
True
Is 4 grams of oxygen bigger than 1 mole of oxygen
Answer:
No, a mole of oxygen is about 16 grams
Explanation:
What part of the leaf is responsible for absorbing the sun’s energy?
Answer:chlorophyll
Explanation:
The part of leaves that is responsible for absorbing sun's energy is chloroplast.
What is chloroplast?A chloroplast is an organelle found within the cells of plants and certain algae that is responsible for photosynthesis, which is the process by which solar energy is converted into chemical energy for growth.
Small organelles called chloroplasts are found inside plant cells and store sunlight energy.
The chloroplast's thylakoid membranes contain a light-absorbing pigment called chlorophyll, which is responsible for the plant's green color.
They are in charge of photosynthesis, which is the process of converting light energy into sugar and other organic molecules that plants and algae use as food.
They also produce amino acids and lipids, which are required for the production of chloroplast membranes.
Thus, the chloroplast is the part that traps the energy of the Sun.
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Differentiate between a mixture and a compound. Provide an example of each using the characteristics outlined in the lesson to support your example.
Explanation:
A compound is a pure substance formed by the combination of two or more kinds of atoms or elements joined together in a definite grouping.
An mixture is an impure substance made up of different types of substances.
Here are some of the differences between them;
A compound is a pure substance whereas a mixture is an impure substance. All parts of a compound are homogenous throughout where a mixture is often heterogeneous. Compounds have definite compositions whereas mixtures do not have a definite composition. Compounds cannot be easily broken down by physical means whereas in mixtures, separation is by physical means. Compound have a unique set of physical properties whereas mixtures have varied set of physical properties.Examples of compounds are water, sodium chloride, hydrochloric acid
Mixtures are air, ocean water, alloys, et.c
the diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visble light is represented by which letter?
Answer:D
Explanation:
What is The Magnus Effect/Force? Explain.
Answer:
dk
Explanation:
5. What does the symbol in the picture represent? *
A.Battery
B.Resistor
C.Wire
D.Bulb
Why is an ice cube less dense than liquid water?
O A. Molecules in ice have less space between them than molecules in liquid water
O B. Molecules in ice are more spread out than molecules in liquid water.
O C. Ice molecules have less mass than water molecules.
O D. Ice molecules have more mass than water molecules.
Anwser is B. Just got correct.
Answer:
B hope this helps
Explanation:
The density of a substance describes how closely its molecules are packed. Despite the fact that ice is a solid form, an ice cube contains many pores in and the molecules are more spread in the state than that in liquid state of water.
What is density?Density of a substance is the measure of its mass per unit volume. It describes how closely packed its molecules within a given volume. If the molecules have enough space to spread they will be less dense.
The objects which are less dense than water will float in it. Whereas which are having more density will sink on it. Ice floats on water because, ice is less dense than water.
An ice cube has a pore structure and one ice cube contains fewer water molecules and which are spread through the porous structure. Therefore, water in liquid state is more dense than ice.
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Pls help thank you I really need
Answer:
A
Explanation:
Answer:
30 mph
Explanation:
determine the mass of 840 cm3 of oxygen gas, O2 at rtp
Answer:
Mass = 0.96 g
Explanation:
Given data:
Volume of oxygen = 840cm³
Temperature = at room = 25°C
Pressure = at room = 1 atm
Mass of oxygen = ?
Solution:
Volume of oxygen = 840 cm³ × 1 L /1000 cm³ = 0.84 L
Temperature = 25 +273.15k = 298.15 K
Formula:
PV = nRT
n = PV/RT
R = 0.0821 atm.L/mol.K
n = 1 atm × 0.84 L / 0.0821 atm.L/mol.K × 298.15 K
n = 0.84 atm.L / 24.48 atm.L/mol
n = 0.03 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.03 mol × 32 g/mol
Mass = 0.96 g
DEFINITION: ABILITY OF A SUBSTANCE TO BE DISSOLVED
Answer:
Solubility
Explanation:
If its not that the answer is Dissolvable.... you didn't give a word bank.
:))))))))))
What is the ratio of carbon, hydrogen, and oxygen in most carbohydrates?
A.
1:1:1
B.
1:2:1
C.
1:2:3
D.
2:1:1
E.
2:2:1
Answer:
1:2:1
Explanation:
i just think hai .its just a guess from my side...sorry if i m wrong...
Answer:
1:2:1
Explanation:
Hello person in the future. Good luck with your test and I hope you do great things with your life. You got this!! :D
Which statement about erosion is true? Most erosion occurs too slowly to observe. Most erosion occurs too quickly to observe, Erosion can happen very quickly or very slowly. It is not possible to measure erosion rates.
Answer:
Erosion can happen very quickly or very slowly.
e.g splash erosion occurs slowly while gulley erosion occurs very fast.
A drug is commercially available in capsules each containing 12.5 mg of drug and 37.5 mg of diluent. How many milligrams of additional diluent must be added to the contents of one capsule to make a dilution containing 0.5 mg of drug in each 100 mg of powder
Answer:
2450 mg
Explanation:
From the given information:
The total weight of the capsule = 12.5 mg + 37.5 mg
= 50 mg
The percentage of drug in each capsule = [tex]\dfrac{12.5}{50} \times 100[/tex]
= 25%
= 0.25
To make 0.5 mg of drug in each 100 mg of powder after dilution;
Then, the drug percent in each capsule after dilution is:
[tex]=\dfrac{0.5}{100}\times 100[/tex]
= 0.5%
= 0.005
Suppose (p) mg represent the amount that is added to the diluent in the given capsule. Then;
The total amount is = (50 + p) mg
Since the amount of the drug = 12.5 mg
Then the concentration [tex]=\dfrac{12.5}{50 + x}[/tex] which needs to be equal to the needed concentration that is diluted.
i.e.
[tex]\dfrac{12.5}{50 + x} = 0.005[/tex]
By cross multiply;
(50 + x) 0.005 = 12.5
(50 × 0.005) + (0.005x) = 12.5
0.25 + 0.005x = 12.5
0.005x = 12.5 - 0.25
0.005x = 12.25
x = 12.25 / 0.005
x = 2450 mg
Thus, there is a need for an additional 2450 mg to make a dilution that compass 0.5 mg of drug in 100 mg powder.
What is temperature equilibrium?
A. When particles of matter have reached an equal
temperature
B. The flow of energy from one particle to another
C. When particles of matter are moving in the exact same
manner
Answer: A
Explanation: equilibrium is where all the paricles are at the
If you somehow subtracted a proton from a Zirconium atom, it would be?
Answer:
Yttrium
Explanation:
If you somehow subtracted a proton from a Zirconium atom, it would become a Yttrium atom.
When the number of protons in an atom changes a new element is directly formed. The difference between one atom and the other is the based on the number of protons they contain.
Therefore, when Zirconium loses a proton, it changes to Yttrium which is the atom before Zirconium.
Such reactions as this are very common with nuclear reactions. During a nuclear reaction, the nucleus of an atom changes stability.
can u pls help me with this question
Answer:
B
Explanation:
Which has the larger first ionization energy—magnesium or phosphorus?
a
Phosphorus has the greater first ionization energy.
b
Magnesium and phosphorus have equal first ionization energies.
c
Magnesium, but not phosphorus, has a measurable first ionization energy.
d
Magnesium has the greater first ionization energy.
Answer:
The correct option is a
Explanation:
First ionization energy is the minimum amount of energy required to remove the most loosely bound electron (valence electron) from the outermost shell of a gaseous or neutral atom. Since it takes more amount of energy to remove more electrons, it (ionization energy) generally increases across the period and decreases down a group because the closer the outermost shell is to the nucleus, the more difficult/energy required to remove electrons in that shell.
Since magnesium and phosphorus are on the same period (period 3), it can be deduced from the explanation above that phosphorus has a greater first ionization energy than magnesium because phosphorus (5 valence electrons) has more electrons in it's outermost shell than magnesium (2 valence electrons).
Plzzzzzzzz helpppppppppp
Answer:
true
Explanation:
They explained it in the answer
helium gas diffuses 4 times as fast as an unknown gas. What is relative molecular mass of the gas
The relative molecular mass of the gas : 64 g/mol
Further explanationGiven
Helium rate = 4x an unknown gas
Required
The relative molecular mass of the gas
Solution
Graham's Law
[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
r₁=4 x r₂
r₁ = Helium rate
r₂ = unknown gas rate
M₁= relative molecular mass of Helium = 4 g/mol
M₂ = relative molecular mass of the gas
Input the value :
[tex]\tt \dfrac{4r_2}{r_2}=\sqrt{\dfrac{M_2}{4} }\\\\16=\dfrac{M_2}{4}\\\\M_2=64~g/mol[/tex]
A solution containing 4.15 g of magnesium chloride is added to a second solution containing excess
sodium sulfate. Magnesium sulfate precipitates.
•Calculate the ideal yield of magnesium sulfate
. If actual yield is 3.95 g, calculate percentage yield
1. Eq.:
2. Given:
3. Wanted:
4. Answer:
Answer:
1. 5.24 g
2. 75.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
MgCl₂ + Na₂SO₄ —> MgSO₄ + 2NaCl
Next, we shall determine the mass of MgCl₂ that reacted and the mass of MgSO₄ produced from the balanced equation. This can be obtained as follow:
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
Molar mass of MgSO₄ = 24 + 32 + (16×4)
= 24 +32 + 64
= 120 g/mol
Mass of MgSO₄ from the balanced equation = 1 × 120 = 120 g
SUMMARY:
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
1. Determination of the ideal yield of magnesium sulfate, MgSO₄.
From the balanced equation above,
95 g of MgCl₂ reacted to produce 120 g of MgSO₄.
Therefore, 4.15 g of MgCl₂ will react to produce = (415 × 120)/95 = 5.24 g of MgSO₄.
Thus, the ideal yield of magnesium sulfate, MgSO₄ is 5.24 g
2. Determination of the percentage yield.
Actual yield of MgSO₄ = 3.95 g
Ideal yield of MgSO₄ = 5.24 g
Percentage yield =?
Percentage yield = Actual yield / Ideal yield × 100
Percentage yield = 3.95 / 5.24 × 100
Percentage yield = 395 / 5.24
Percentage yield of MgSO₄ = 75.4%
What does point of view refer to?
the purpose of whoever is telling the story
the age of whoever is telling the story
the perspective of whoever is telling the story
Answer:
I'd say the most reasonable answer is perspective.
Explanation:
"Point of view" is about who is telling and sharing the details in what you are writing or reading. I'm not 100% sure because the word "perspective" doesn't seem like the right word to use, but it's better than the other two in my opinion.
A 1.00-L flask was filled with 2.00 moles of gaseous and 2.00 moles of gaseous and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous was present. Assume that the reaction
SO2 + NO2 ⇌ SO3 + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Answer:
2.35
Explanation:
A 1.00-L flask was filled with 2.00 moles of gaseous SO₂ and 2.00 moles of gaseous NO₂ and heated. After equilibrium was reached, it was found that 1.21 moles of gaseous NO was present. Assume that the reaction
SO₂ + NO₂ ⇌ SO₃ + NO
occurs under these conditions. Calculate the value of the equilibrium constant, K, for this reaction.
Step 1: Calculate the molar concentrations
Since the reaction takes place in a 1.00 L flask, the molar concentrations are:
[SO₂]i = 2.00 M
[NO₂]i = 2.00 M
[NO]eq = 1.21 M
Step 2: Make an ICE chart
SO₂ + NO₂ ⇌ SO₃ + NO
I 2.00 2.00 0 0
C -x -x +x +x
E 2.00-x 2.00-x x x
Step 3: Calculate the concentrations at equilibrium
The concentration of NO at equilibrium is 1.21 M. Then, x = 1.21.
[SO₂]eq = 2.00-1.21 = 0.79 M
[NO₂]eq = 2.00-1.21 = 0.79 M
[SO₃]eq = x = 1.21 M
[NO]eq = x = 1.21 M
Step 4: Calculate the value of the equilibrium constant, K, for this reaction
K = [SO₃] × [NO]/[SO₂] × [NO₂]
K = 1.21²/0.79² = 2.35
Help me pls I’m so lost pls ASAP thank you
Answer:
The 2nd answer.
Explanation:
DNA makes people who are related look similar to eachother.
has DNA that tells the rest of the organelles what to do
Answer:
No
Explanation:
i honestly don't know
If you have a gas sample with an initial pressure of 4 atm and a volume of 550 L, what will the final volume be if you change the pressure to 2.3 atm?
Answer:
V₂ = 956.52 L
Explanation:
Given data:
Initial pressure = 4 atm
Initial volume = 550 L
Final volume = ?
Final pressure = 2.3 atm
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
4 atm × 550 L = 2.3 atm × V₂
V₂ = 2200 atm. L/ 2.3 atm
V₂ = 956.52 L
So its not A so its B C or D plz help
Answer:
the answer is B
hope this helped!
Is the enzyme lactase a catalyst? why or why not?
Answer:
Explanation:
The enzyme lactase acts as a catalyst to facilitate the reaction and make it happen very quickly. This enzyme is made u.
do the rest
hope it helps
Enzyme lactase catalyzes the hydrolysis of the glycosidic bond of lactose to form galactose and glucose.
What is lactase?Lactase can be described as an enzyme produced by many organisms. Lactase is located in the small intestine of humans and other mammals. It is essential to accomplish the digestion of milk and it breaks down lactose that gives milk its sweetness.
A person with a deficiency of lactase, and who consume dairy products, may experience the symptoms of lactose intolerance. Lactase is a part of the β-galactosidase family of enzymes and is a glycoside hydrolase involved in the hydrolysis of lactose into constituent galactose and glucose monomers.
The β-glycosidic bond in D-lactose in metabolism is hydrolyzed to form D-galactose and D-glucose, which can be absorbed into the bloodstream. The optimum temperature of the human lactase is about 37 degrees Celcius and the optimum pH of the human lactase is equal to 6.
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When dominant traits are present they cover up or hide recessive traits
True or false
Answer:
True
Explanation:
If dominant traits are there, then they take over. Periot
Which process causes earth surface to warm
7. Based on the conclusion in question 5, what type of leaves would be most beneficial for plants indigenous (native) to a desert?* O Wide leaves, with high surface area O Thin narrow leaves, with low surface area It wouldn't make a difference - any leaves will work in any area. PLEASE HElP ASAP PLEASEEEEEEE
Answer:
I don't know what question 5's conclusion is but if i were to take a guess here i would say wide leaves with a high surface area
Explanation:
to soak up water and maybe provide shade for the roots and dirt under the plant.